參數(shù)資料
型號： XRT4000
廠商： Exar Corporation
英文描述： Universal Multiprotocol Serial Interface
中文描述： 通用多協(xié)議串行接口
文件頁數(shù)： 7/46頁
文件大?。?/td> 396K
代理商： XRT4000
XRT4000
Rev. 1.00
- 7 -
PIN DESCRIPTION (CONT’D)
Pin
#
35
Symbol
DTE
Mode
LLA
DCE
Mode
LLA
Type
Function
TR7
I/O
DTE Mode -
Transmitter 7
- Single Ended Data Output to line
DCE Mode -
Receiver 7
- Single Ended Data Input from line
Digital Input
- Refer to Mode Control Table
DTE Mode
-
Receiver 6
- Negative Data Differential Input
from line
DCE Mode
-
Transmitter 6
- Negative Data Differential
Output to line
DTE Mode
-
Receiver 6
- Positive Data Differential Input from
line
DCE Mode
-
Transmitter 6
- Positive Data Differential Output
to line
DCE/DTE Select
- Selects operating mode
. Logic 0
: DTE
Mode.
Logic 1
: DCE Mode. Internal 20K
pull-up
Digital Output
- Refer to Mode Control Table
Receiver 5
- Digital Data Output to equipment
Enable Clock Mode
- Active Low,
Logic 0
: Echoed Mode.
Logic 1
: Normal Mode. Internal 20K
pull-up
Receiver 5
- Positive Data Differential Input from line
Receiver 5
- Negative Data Differential Input from line
Receiver 4
- Negative Data Differential Input from line
Receiver 4
- Positive Data Differential Input from line
Analog Output
- Resistor connected between this pin and
Ground controls transmitter output pulse rise and fall time in
V.10 or V.28 mode as specified in Figures 15 and 16
respectively.
Receiver 4
- Digital Data Output to equipment
Digital GND
for Receiver 4, 5, 6
36
37
TX76D
TR6A
D_LL
DCDA
D_DCD
DCDA
I
I/O
38
TR6B
DCDB
DCDB
I/O
39
DCE/DTE*
LOW
HIGH
I
40
41
42
RX67D
RX5D
EC*
D_DCD
D_DSR
D_LL
D_DTR
O
O
I
43
44
45
46
47
RX5B
RX5A
RX4A
RX4B
SLEW_
CNTL
DSRB
DSRA
CTSA
CTSB
DTRB
DTRA
RTSA
RTSB
I
I
I
I
O
48
49
50
51
52
53
54
55
RX4D
GND
NC
NC
GND
NC
VSS
E_232H*
D_CTS
D_RTS
O
Analog GND
for bias generator.
Analog Substrate
- Connect to -6V
High Speed RS-232 Enable
-
Logic 0:
Enables high speed
RS-232 mode (drives 3K
in parallel with 1000pF at 256KHz).
Internal 20K
pull-up
Analog VDD
for bias generation circuit; Connect to +5V
VPP
- Connect to +12V supply
I
56
57
58
59
60
61
62
63
VDD
VPP
NC
NC
NC
NC
VPP
VR
VPP
- Connect to +12V supply
VR
- Internally generated +2.2V Reference (Sources 20
μ
A
maximum)
O
Note:
An asterisk (*) following a pin symbol indicates that the pin is active low.
Names begining with D_ are digital signals.
Names ending with B and A are the positive and negative polarities of differential signals respectively
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